Rectangular glass area – 24 square dm. Glass length – 6 dm. Find the perimeter of the glass.

The area of the rectangle is calculated by the formula:
S = a * b.
Determine the width of rectangular glass, provided that S = 24 dm², a = 6 dm (to find the second factor, divide the product by the first):
b = S: a = 24: 6 = 4 dm.
The perimeter is the sum of all sides. For such a figure, it is determined by the formula:
P = 2a + 2b = 2 * 6 + 2 * 4 = 12 + 8 = 20 dm.